Coaster brake with back-pedaling device



Patented @et 16, 1923.

unirse ria-tr I, aan

eonnoN mienten, or rninnnnmnia PnNN'sYLvnNIA, AssiGNoa 'ro A. innony COMPANY, OF VANIA.

EAtLADELP-EA, PENNSYLVANIA, A CORPORATION OF PENNSYL- coiisrnia BRAKE WITH nsoiernnnniNG nnvron.

application inea Maren as," 1922. serial n5541353.

'for veloeipedes though it is noted that the- :fork of the velocipede,'cranks having tubular spindles journalled in said bearings and each formed with a squared portion'receiving thereon a set or" brake shoes mounted on polygonal portions of the spindles and outwardly actuatedy by said squared portions and provided with end grooves receiving annular slit springs tending to retain said shoes in engagement with the spindles. The

l' wheel hub encloses the brake shoes, and

Clutch rollers disposed in longitudinal recesses of the brake shoes between the hub and the brake shoes operatively connect them whenV the cranks are turned in forward direction. Y, Y

In said patent forward peflalingfcauses the rollers to engage and clutchl the hub to drive the velocipede forward. Reverse pedaling unclutches the rollers' and lets i the pedals turn freely backwards. lhen the pedals are at the` same time pressed, one forward and the other backward, the brake shoes engage the hub and-put on the brake.

As above noted reverse pedaling Causes the vpedals of said patent to turn freely backward,vthus preventing the rider from driving' the velooipede backwards. It is this feature that. the present invention has for its object toremovef the brake;

To'this end my invention, brieystated, is as follows: i j.'

Instead of four brake shoes as in said patent, three outwardly movable brake shoes are mounted on the alined spindlesand enclosed Vby the cylindrical sleeve hub. In place of the missing shoe is disposed a clutch device interposed between adjacent shoes comprising an inner member' resting against said spindles, and|. a Vwedge-shaped outer niemberfadapted to be wedged between the inner member andthe y'sleeve' by f backward rotation oi thecranks and spindles of the vehicle, whereby the vehicle may be driven backwardly. n j

Other objects of the invention will appear as the description proceeds; and while herein details'of the Ainvention are'described, the invention' is notV limited to these, since many and various changes maybe made ithoutdeparting from the scope of the invention as claimed. l.

In the accompanying" drawing, showing by way of example several of manypossible embodiments of the invention, j l

Fig. 1 is a longitudinal vertical section showing my'inven'tionVv as applied tothe driving wheel ,of a velocipede; 'A

`Figs. 2 and 3 arerespectively' front and end elevations of Fig. 1 is aV central transverse sectional view of the-brake ofAFig. 1; and y Y Figs. 5 and 6 are similar sectional views` of modifications;

The improved coaster brake is shownl in combination with the prongs or branches' 1Q the interior mechanism ot of the fork' of a"velocipede,`said branches having annular end portions 11 Ain which are mounted ball bearings 12 for the reception of the cylindricalA portions lfofthe tubulary spindles 14, which have their outer ends'in# tegral with the pedal cranks 15. "Said tubu- .lar spindles'are connected and held inplace by a l bolt- 16 extendingl. longitudinally through them` and through thecranks 15, said bolt having o n its opposite ends nuts 17', although obviously it may be otherwise constructed.y i A The inner or 4 spindles are provided diiametrically opposite cylindricalportions 2O (Fig. 3),":and dia-- adjacent ends19 oivfrthe crank` Yion metrically opposite ,'lattenedportions 22and 1 `l tit) CED

23. The cylindrical portions and the flattened portion 22 support segmental brake shoes 24 and 25, whose outer surfaces 26 are cylindrically curved to lit within and. substantially till the cylindrical hub sleere 2? (Figs. l and el) of the velocipede wheel, ot which only sleeve 27, the end flanges 2S and parte ot the spokes 29 are here snou'n.:

In the present instance the shoes 20 have tangentially disposed engagingtaces 3l and 32 and also are respectively n'ovided with round and flat. 'faces 34 and for engagement -with'tlie cylindrical and flat sides ot the ends 19 ot' the cranlr spindles. At each end Ot the aspring 3G (lbfl) is disposed, in an annular groove 37 formed in the brakeshoes whereby all of the shoes are yieldably held'togjether and caused to return to positions with their faces 34 and 35 1n kengagement with the faces of the spindle ends 19 as shown inFig. ll.-

The shoes 24 and 25 are preferably itorrned` with` alongitudinally extending' recess 39- in their cylindrically curred f tacos for the reception of clutch rollers 40, the bottoni of each of these recesses, in the present instance, being` provided with a wear plate -l. on which the roller rests, and are inclined at an acute angle to the adjacent inner surface ot the hub sleeve, so that when the shoes are turned in the 'forward direction all ot the rollers are caused to frictionally engage with. thehub sleeve with a wedging action for rotating the wheel and driving the velocipede forwardly.

The shoes 24; and 25 as thus tar described are very similar to those ot said patent, e;- cept that those here shownv are oli' a forwardly pointing wedge' shape; and in the case ot the forni ot lFigs. l to 4f and 6 there are only three oi' theshoes. In the pla ce of the 'fourth shoe, is disposed the back-pet alH ing clutch device forming the main subject matter ot the present invention,

rhe back-pedaling' clutch device lis disposed anjainstthe flattened tace 23 and comprises an outer member llland an inner ineinber inthe latter abutting against the rear adjacent shoe 24, and having,` a flat inner tace 46 resting partly against said flattened tacel23 and the adjacent nace ot the next forward shoe and terminating' intermediately of said adjacent face 4:7. The inner member l5-is, provided. Ywith a curved outer face 48 meeting' the forward end ot said inner tace 47 and also has an outwardly disposed reary tlange forming a stop shoulder 50. The outer memberlil is a. forwardly pointing approximately wedgeV shaped member rear-- .vardly abutting .said shoulder 50 andanorwardly engaging flat against said adjacent face i7 ot the. neigttorward shoe and having a `curved inner surface 52 engaging' saidv curved `tace .48 of the inner member. outer'mernber is provided with a curved Said*y outer tace 53 adjacent to the inner tace of said sleeve 27 and out of clutching engage` nient with the .Y sleeve when the vehicle is coasting` 'forwardly and driven into clutching` engagement with said sleeve by the .redginbot' the outer member lll between the inn-er member and the sleeve 27 when the spindles'llare rotated backwardly.

The sections 414.- and a are not quite as long' as the shoes 24; and 25 and when placed one on the other lie loose in the hub sleeve. These sections are prevented from falling out ot the sleeve by the sleeve itselr" and by two small sections or plates 55 (Figs. 2 and equivalent in shapelto the crossv sect-ion ot the shoe 25 without the grooves 39. rlhese plates are held at the ends ot' the sections and t5 and are, in turn kept in place by the rings 36. Y a

rllhe coasterbrake as a whole, rests between the spindles 13 and the inner wall ot the sleeve 27 the drawing` shows. rlhis arrangement, allows the sleeve to revolve on the cylinder formed by the shoes 2Liand 25 and the sections lll ande-5.

In operation the crank spindles 14 are held from longitudinal movement on the bolt' 16,.'but may be independently turned on said bolt to a limited extent. lit the cranks l5 be turned forwardly, in a counterclockwise direction, in Fig. t, as indicated by the ari-ow, theshoes 24 and 25 on the ends 1,9 ol2 the spindles 14 are turned with them and the rollers l0y engage with the sleeve 27 with a wedging` action thereby to clutch said shoes to the hub sleeve 2l. rEhe sleeve 27 with the wheel attached thereto may thus be turned and the vehicle driven in a 'Forward direction.

lt the torce applied to rotate the cranks be removed, the shoes are held inwardI by the spring rings 36 and the wheel is free to turn forward independently ofthe cranks l5 and thel shoes 24 and 25, and such Yforward movement, while the cranks do not rotate will cause the rollers 40 toymove into inoperative positions at the deepestk part ot the recesses 39 and out ot the contact with the'sleeve, thereby permitting' the vehicle to coast. lt now one ot the pedals be annu! larly rotated relatively to the other` as wouldoccur it the pedals were pressed in opposite directions or it one oit them was held and the other pressed backwardly. there` is a relative angular displacement ot the ends i9 which causes the tiattened faces 22 and 23 to torce outwardly the shoe 25 into `trifftional braking or retarding` contact with the sleeve At the saine time the section Ll5 is pivoted and the section la slides rer it because of rictionrwith the sleeve 27 The Jr'orward rotation of the wheel, and forward. motion of the vehicle are thusY retarded, and this braking action may be stopped attain`r allowing the pedals and hence" the shoe25 to of the rings 26.

The operation above described is generally similar to that shown in said patent.

N ow will be described the operation of thebaclr-pedaling clutch device whereby the vehicle may be driven backward.

Then the vehicle has beenbrouglitto a stop andthe pedals are. revolved backwardly, the sliding friction ot the section 44 with the sleeve tends to wedge Vthis section tight between the sleeve and the section 45 and bind the sleeve to the brake. rlhus the back-pedalinp,` may be accomplished and the vehicle made t0 run backwards.

The coaster brake of Fig. 5 is very similar tofthat of Fig'. 4 except that theA inner end 'lQot the spindle is squared, and the shoes :74' are identical in shape to the shoe 25 of Fig. 4 and rest flat against diametrically opposite flat sides Q0', whilein place of the shoel 25 ot Fig. 4 the clutch device comprisingr the outer and inner sections Y44 and 45V is substituted. The operation of thebrakeof 5v is similar to that oi Fig. 4 except that. in the brake '01?.Fiea 5, the shoes 24 are 'pressed against the sleeve 27 when the ends 19 are relatively rotated. The function and operation ot' the sections 44 .and 45 istlie same as in Fig. 4. The' coaster brake oit Fig. 6 is similar to that of Fig. 4 excepttiiat a clutch roller 5l shorter than the rsection 4 5 is disposed against the shoulder -50 of the Ainner section 45 and the outer section 44 is narrower vthan the section 44 and rearwardly abats sai roller 5l.

The'braking and coasting action is the same as for the bralre oit' Fig. 6; andthe backward running'yis practically the saine except that the rolling of the roller 5l caused by triction at the beginningv of the back-pedaling operation helps drive the section 44 into wedrgingr action. lclaiin: .A f ,Y l. ln combination, a. rotatable drive means; a driven member rotatable relative to tlie drive means when the drive means is at rest; means whereby the driven member is turned forwardly: and an additional means movable radiallyoutwardly. whereby, when the drive means is rotated backwardlyg the driven nienib'er is thereby votated backw'ardly. I In combination. a drive ineans; b shoes rotatable on said in ans; a sleeio enclosingY said shoes; anda clutch device disposed between adjacent shoes.

3. l'n combination,A a drive means;' ontwardly movable shoes: mounted on said means; a sleeve enclosing` said shoes; and a clutch device disposed between adjacent shoes and between said means and the sleeve.

4. In combi-nation. -a drive means; out- Wardly movable shoes mounted en said means; a cylindrical sleeveenclosingr` said shoes; anda clutch device operable by wedgingf actionA disposed between adjacent shoes and between said means andfthe sleeve.

j 5. lncoinbination', a ldrive lrneansgout- .wardly movable brake shoes mounted on and rotatable by said means; a cylindrical sleeve enclosingsaid shoes; anda clutch device operable by.,wedging action disposed tweenwadjacent shoes and between said means and the sleeve, and compr' outer section movable outwardly.V said sleeve.V

tln combination, a drive means; three toward otitwardly movable brake shoes .mounted on i said nieans; a v cylindrical sleeve enclosing; said shoes; andaI Vclutch device disposed between said adjacent shoes an'dagainst said means andcomprising an inner member resting against said means g and a forwardly pointing wedge shaped outer member adapted to be wedged between the innery member and the sleeve by backward rotation .of said means. f -f 7. ln combinatiom'a pair or a-lined spindles having diametrically opposite iiattened side portionsand intermediate portions relatively movable'brake shoes respectively mounted on said intermediate.portions and one' of the flattened portions; a `sleeve en-V closing said shoes.; clutch means disposed between said shoes and sleeve and operative on forward movement; aninner member resting against the other flattened portion gand a forwardly pointing wedge-shaped outer member disposed between the-inner menib erand the sleeve and adapted to be wedged therebetween by backward rotation ef'the spindles. f V8'. in combination, a pair o'f alined spindles diametricallyV opposite 'flattened side tion; a cylindrical sleeve enclosing said shoes g clutch fmeans disposed between said shoes and sleeve and operative when the` shoes are turned torwarffl.a 'torwaif'dlv pointing wedge-shaped inner niemeer abuttin against the rear ad'acentshoes and E t, l

resting partly against the other tlattenedl portion and the nexttorward slioesranda forwardly .pointing wedge-shaped outer meniberengagingr the `nent torward slioeanilY f said inner member', and disposed adjacent tosaid sleeveand adapted to be wed, be-

tween the inner member andthe sleeve .by

backward rotationfof the spindles. l

-9. lincombination7 a pair ot alined spin?-v dles each having diametrically opposite cylindrical portions and flattened portions; relatively movable brake shoes respectivelymounted against said cylindrical portions and one of the iiattened portions, and each of forwardly pointing wedge-shape and having curved outer face co-aXial with the spindles; a cylindrical sleeve enclosing said shoes; clutch means disposed between said shoes and sleeve operative when the shoes are turned forwardly; a clutch device disposed against the other flattened face and comprising a forwardly pointed wedgeshaped inner member abutting against the rear adjacent shoe and having a curved outer face, a. flat inner face resting partly against said flattened face and the adjacent face of the next forward shoe and terminating intermediately of said adjacent face, and an outwardly disposed rear flange forming a stop shoulder; a forwardly pointing wedge-shaped outer member rearwardly abutting said shoulder and forwardly engaging flat against said adjacent face and having a curved inner surface engaging said curved face, and a curved outer face adjacent to said sleeve.

l0. In combination,I a drive means; yieldably outwardly movable brake shoes mounted on said means; a sleeve enclosing said shoes; a clutch device disposed between adjacent shoes and between the drive means and the sleeve; and retaining means disposed against the ends of said device.

1l. ln combination, a drive means; a plurality 0f outwardly movable brake shoes mounted on said means; spring means for holding said shoes on the drive means; a sleeve enclosing said shoes; an inner member disposed between adjacent shoes and resting against said drive means; a wedge member disposed between the inner member and the sleeve; and end plates disposed between the ends 'of said members and the spring means.

l2. ln combination, a drive means; three outwardly movable brake shoes mounted on said means and provided with outwardly opening grooves in the ends; spring rings in said grooves; a cylindrical sleeve enclosing said shoes; an inner member disposed between said adjacent shoes and resting against said means; a forwardly pointing wedge-shaped outer clutch member disposed between and adapted t0 be wedged between the inner member and the sleeve; and end plates disposed between the ends of saiti members and the rings.

13. ln combination, alined spindles having squared ends; two outwardly movable brake shoes mounted against` oppositeY sides of said ends; a cylindrical sleeve enclosing said shoes; and a pair of clutch devices disposed between saidshoes and against the iat/'Lave other sides of said'ends and comprising an inner member resting against said means, and a forwardly pointing wedge-shaped outer member adapted to be wedged between the inner member and the sleeve by baclrward rotation of said means.

14, ln combination, a pair of alined spindles diainetrically opposite flattened side portions and intermediate rounded portions; relatively movable brake shoes respectively mounted on said intermediate portions and one of the flattened portions and each being of forwardly pointing wedge-shaped section; a cylindrical sleeve enclosing said shoes; clutch means disposed between said shoes and sleeve and' operative when the shoes are turned forward; a clutch device disposed against the other flattened face and comprising an inner member abutting against the rear adjacent shoe and having a flat inner face resting partly against said attened face the adjacent face of the next forward shoe and terminating intermediately of said adjacent face; said inner member having a curved outer face meeting the forward end of said inner face; and an outwardly disposed rear flange forming a stop shoulder; a clutch lroller disposed against said shoulder; a forwardly pointing wedge-shaped outer member rearwardly abuttingy said roller and forwardly engaging Hat against said adjacent face of the neXt forward shoe and having a curved inner surface engaging said curved face of the inner member7 and a curved outer face adjacent to the inner face of said sleeve.

l5. ln combination, a pair of alined spindles diametrically opposite flattened side portions and intermediate portions; relatively movable brake shoes respectively mounted on said intermediate portions and one of the flattened portions and each being of forwardly pointing wedge-shaped section.; and a cylindrical sleeve enclosing said shoes.

16. ln combination, a pair of alined spindles each having diametrically opposite cylindrical portions and flattened portions; relatively movable brake shoes respectively mounted against said cylindrical portions and one of the flattened portions, and each of forwardly pointing wedge-shape and having a curved outer face co-axial with the spindles; a cylindrical sleeve enclosing said shoes; and clutch rollers disposed between said shoes and sleeve operative when the shoes are turned forwardly. i

, GORDON T. lilALiN.

`Witnesses:

ALBERT E. PARKER, WILHAM fl. Widmann;

lll@ 

